Adding cast support to an app you already have is a small, sensible piece of work: your users get content onto the big screen from a device they already know how to use, and you avoid building and maintaining a separate TV application altogether. For most video and audio content, that is the whole answer. A dedicated TV app only becomes worthwhile when people browse and choose directly on the television rather than reaching for a phone first, or when you need the discoverability of a TV platform’s own store. The practical details that matter are the unglamorous ones — what happens when the connection drops, how playback position is kept in sync, and how subtitles and audio tracks carry across — and those are where we concentrate the testing.